feat(material/tabs): label & body classes

src/material-experimental/mdc-tabs/tab-body.ts

@@ -56,7 +56,8 @@ export class MatTabBodyPortal extends BaseMatTabBodyPortal {
   templateUrl: 'tab-body.html',
   styleUrls: ['tab-body.css'],
   encapsulation: ViewEncapsulation.None,
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  // tslint:disable-next-line:validate-decorators
+  changeDetection: ChangeDetectionStrategy.Default,
   animations: [matTabsAnimations.translateTab],
   host: {
     'class': 'mat-mdc-tab-body',

src/material-experimental/mdc-tabs/tab-group.html

@@ -15,10 +15,11 @@
        [attr.aria-posinset]="i + 1"
        [attr.aria-setsize]="_tabs.length"
        [attr.aria-controls]="_getTabContentId(i)"
-       [attr.aria-selected]="selectedIndex == i"
+       [attr.aria-selected]="selectedIndex === i"
        [attr.aria-label]="tab.ariaLabel || null"
        [attr.aria-labelledby]="(!tab.ariaLabel && tab.ariaLabelledby) ? tab.ariaLabelledby : null"
-       [class.mdc-tab--active]="selectedIndex == i"
+       [class.mdc-tab--active]="selectedIndex === i"
+       [ngClass]="tab.labelClass"
        [disabled]="tab.disabled"
        [fitInkBarToContent]="fitInkBarToContent"
        (click)="_handleClick(tab, tabHeader, i)"
@@ -36,12 +37,12 @@
     <span class="mdc-tab__content">
       <span class="mdc-tab__text-label">
         <!-- If there is a label template, use it. -->
-        <ng-template [ngIf]="tab.templateLabel">
+        <ng-template [ngIf]="tab.templateLabel" [ngIfElse]="tabTextLabel">
           <ng-template [cdkPortalOutlet]="tab.templateLabel"></ng-template>
         </ng-template>
 
         <!-- If there is not a label template, fall back to the text label. -->
-        <ng-template [ngIf]="!tab.templateLabel">{{tab.textLabel}}</ng-template>
+        <ng-template #tabTextLabel>{{tab.textLabel}}</ng-template>
       </span>
     </span>
   </div>
@@ -57,6 +58,7 @@
                [attr.tabindex]="(contentTabIndex != null && selectedIndex === i) ? contentTabIndex : null"
                [attr.aria-labelledby]="_getTabLabelId(i)"
                [class.mat-mdc-tab-body-active]="selectedIndex === i"
+               [ngClass]="tab.bodyClass"
                [content]="tab.content!"
                [position]="tab.position!"
                [origin]="tab.origin"

src/material-experimental/mdc-tabs/tab-group.spec.ts

@@ -1,6 +1,6 @@
 import {LEFT_ARROW} from '@angular/cdk/keycodes';
 import {dispatchFakeEvent, dispatchKeyboardEvent} from '../../cdk/testing/private';
-import {Component, OnInit, QueryList, ViewChild, ViewChildren} from '@angular/core';
+import {Component, DebugElement, OnInit, QueryList, ViewChild, ViewChildren} from '@angular/core';
 import {
   waitForAsync,
   ComponentFixture,
@@ -40,6 +40,7 @@ describe('MDC-based MatTabGroup', () => {
         TabGroupWithIndirectDescendantTabs,
         TabGroupWithSpaceAbove,
         NestedTabGroupWithLabel,
+        TabsWithClassesTestApp,
       ],
     });
 
@@ -420,11 +421,16 @@ describe('MDC-based MatTabGroup', () => {
 
       expect(tab.getAttribute('aria-label')).toBe('Fruit');
       expect(tab.hasAttribute('aria-labelledby')).toBe(false);
+
+      fixture.componentInstance.ariaLabel = 'Veggie';
+      fixture.detectChanges();
+      expect(tab.getAttribute('aria-label')).toBe('Veggie');
     });
   });
 
   describe('disable tabs', () => {
     let fixture: ComponentFixture<DisabledTabsTestApp>;
+
     beforeEach(() => {
       fixture = TestBed.createComponent(DisabledTabsTestApp);
     });
@@ -780,6 +786,62 @@ describe('MDC-based MatTabGroup', () => {
     }));
   });
 
+  describe('tabs with custom css classes', () => {
+    let fixture: ComponentFixture<TabsWithClassesTestApp>;
+    let labelElements: DebugElement[];
+    let bodyElements: DebugElement[];
+
+    beforeEach(() => {
+      fixture = TestBed.createComponent(TabsWithClassesTestApp);
+      fixture.detectChanges();
+      labelElements = fixture.debugElement.queryAll(By.css('.mdc-tab'));
+      bodyElements = fixture.debugElement.queryAll(By.css('mat-tab-body'));
+    });
+
+    it('should apply label/body classes', () => {
+      expect(labelElements[1].nativeElement.classList).toContain('hardcoded-label-class');
+      expect(bodyElements[1].nativeElement.classList).toContain('hardcoded-body-class');
+    });
+
+    it('should set classes as strings dynamically', () => {
+      expect(labelElements[0].nativeElement.classList).not.toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).not.toContain('custom-body-class');
+
+      fixture.componentInstance.labelClassList = 'custom-label-class';
+      fixture.componentInstance.bodyClassList = 'custom-body-class';
+      fixture.detectChanges();
+
+      expect(labelElements[0].nativeElement.classList).toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).toContain('custom-body-class');
+
+      delete fixture.componentInstance.labelClassList;
+      delete fixture.componentInstance.bodyClassList;
+      fixture.detectChanges();
+
+      expect(labelElements[0].nativeElement.classList).not.toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).not.toContain('custom-body-class');
+    });
+
+    it('should set classes as strings array dynamically', () => {
+      expect(labelElements[0].nativeElement.classList).not.toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).not.toContain('custom-body-class');
+
+      fixture.componentInstance.labelClassList = ['custom-label-class'];
+      fixture.componentInstance.bodyClassList = ['custom-body-class'];
+      fixture.detectChanges();
+
+      expect(labelElements[0].nativeElement.classList).toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).toContain('custom-body-class');
+
+      delete fixture.componentInstance.labelClassList;
+      delete fixture.componentInstance.bodyClassList;
+      fixture.detectChanges();
+
+      expect(labelElements[0].nativeElement.classList).not.toContain('custom-label-class');
+      expect(bodyElements[0].nativeElement.classList).not.toContain('custom-body-class');
+    });
+  });
+
   /**
    * Checks that the `selectedIndex` has been updated; checks that the label and body have their
    * respective `active` classes
@@ -1014,7 +1076,6 @@ class BindedTabsTestApp {
 }
 
 @Component({
-  selector: 'test-app',
   template: `
     <mat-tab-group class="tab-group">
       <mat-tab>
@@ -1080,7 +1141,6 @@ class TabGroupWithSimpleApi {
 }
 
 @Component({
-  selector: 'nested-tabs',
   template: `
     <mat-tab-group>
       <mat-tab label="One">Tab one content</mat-tab>
@@ -1099,7 +1159,6 @@ class NestedTabs {
 }
 
 @Component({
-  selector: 'template-tabs',
   template: `
     <mat-tab-group>
       <mat-tab label="One">
@@ -1215,3 +1274,21 @@ class TabGroupWithSpaceAbove {
   `,
 })
 class NestedTabGroupWithLabel {}
+
+@Component({
+  template: `
+    <mat-tab-group class="tab-group">
+      <mat-tab label="Tab One" [labelClass]="labelClassList" [bodyClass]="bodyClassList">
+        Tab one content
+      </mat-tab>
+      <mat-tab label="Tab Two" labelClass="hardcoded-label-class"
+               bodyClass="hardcoded-body-class">
+        Tab two content
+      </mat-tab>
+    </mat-tab-group>
+  `,
+})
+class TabsWithClassesTestApp {
+  labelClassList?: string | string[];
+  bodyClassList?: string | string[];
+}

src/material-experimental/mdc-tabs/tab-group.ts

@@ -41,7 +41,8 @@ import {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';
   templateUrl: 'tab-group.html',
   styleUrls: ['tab-group.css'],
   encapsulation: ViewEncapsulation.None,
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  // tslint:disable-next-line:validate-decorators
+  changeDetection: ChangeDetectionStrategy.Default,
   inputs: ['color', 'disableRipple'],
   providers: [
     {

src/material-experimental/mdc-tabs/tab-header.ts

@@ -43,7 +43,8 @@ import {MatInkBar} from './ink-bar';
   inputs: ['selectedIndex'],
   outputs: ['selectFocusedIndex', 'indexFocused'],
   encapsulation: ViewEncapsulation.None,
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  // tslint:disable-next-line:validate-decorators
+  changeDetection: ChangeDetectionStrategy.Default,
   host: {
     'class': 'mat-mdc-tab-header',
     '[class.mat-mdc-tab-header-pagination-controls-enabled]': '_showPaginationControls',

src/material-experimental/mdc-tabs/tab-nav-bar/tab-nav-bar.ts

@@ -65,7 +65,8 @@ import {takeUntil} from 'rxjs/operators';
     '[class._mat-animation-noopable]': '_animationMode === "NoopAnimations"',
   },
   encapsulation: ViewEncapsulation.None,
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  // tslint:disable-next-line:validate-decorators
+  changeDetection: ChangeDetectionStrategy.Default,
 })
 export class MatTabNav extends _MatTabNavBase implements AfterContentInit {
   /** Whether the ink bar should fit its width to the size of the tab label content. */

src/material-experimental/mdc-tabs/tab.ts

@@ -25,7 +25,8 @@ import {MatTabLabel} from './tab-label';
   // that creating the extra class will generate more code than just duplicating the template.
   templateUrl: 'tab.html',
   inputs: ['disabled'],
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  // tslint:disable-next-line:validate-decorators
+  changeDetection: ChangeDetectionStrategy.Default,
   encapsulation: ViewEncapsulation.None,
   exportAs: 'matTab',
   providers: [{provide: MAT_TAB, useExisting: MatTab}],

src/material/tabs/tab-group.html

@@ -4,17 +4,19 @@
                [disablePagination]="disablePagination"
                (indexFocused)="_focusChanged($event)"
                (selectFocusedIndex)="selectedIndex = $event">
-  <div class="mat-tab-label mat-focus-indicator" role="tab" matTabLabelWrapper mat-ripple cdkMonitorElementFocus
+  <div class="mat-tab-label mat-focus-indicator" role="tab" matTabLabelWrapper mat-ripple
+       cdkMonitorElementFocus
        *ngFor="let tab of _tabs; let i = index"
        [id]="_getTabLabelId(i)"
        [attr.tabIndex]="_getTabIndex(tab, i)"
        [attr.aria-posinset]="i + 1"
        [attr.aria-setsize]="_tabs.length"
        [attr.aria-controls]="_getTabContentId(i)"
-       [attr.aria-selected]="selectedIndex == i"
+       [attr.aria-selected]="selectedIndex === i"
        [attr.aria-label]="tab.ariaLabel || null"
        [attr.aria-labelledby]="(!tab.ariaLabel && tab.ariaLabelledby) ? tab.ariaLabelledby : null"
-       [class.mat-tab-label-active]="selectedIndex == i"
+       [class.mat-tab-label-active]="selectedIndex === i"
+       [ngClass]="tab.labelClass"
        [disabled]="tab.disabled"
        [matRippleDisabled]="tab.disabled || disableRipple"
        (click)="_handleClick(tab, tabHeader, i)"
@@ -23,12 +25,12 @@
 
     <div class="mat-tab-label-content">
       <!-- If there is a label template, use it. -->
-      <ng-template [ngIf]="tab.templateLabel">
+      <ng-template [ngIf]="tab.templateLabel" [ngIfElse]="tabTextLabel">
         <ng-template [cdkPortalOutlet]="tab.templateLabel"></ng-template>
       </ng-template>
 
       <!-- If there is not a label template, fall back to the text label. -->
-      <ng-template [ngIf]="!tab.templateLabel">{{tab.textLabel}}</ng-template>
+      <ng-template #tabTextLabel>{{tab.textLabel}}</ng-template>
     </div>
   </div>
 </mat-tab-header>
@@ -43,6 +45,7 @@
                [attr.tabindex]="(contentTabIndex != null && selectedIndex === i) ? contentTabIndex : null"
                [attr.aria-labelledby]="_getTabLabelId(i)"
                [class.mat-tab-body-active]="selectedIndex === i"
+               [ngClass]="tab.bodyClass"
                [content]="tab.content!"
                [position]="tab.position!"
                [origin]="tab.origin"